提交的 Sequelize 事务的结果是“未定义”

Question

I am using a Sequelize transaction that returns successfully, however, the result is undefined. As stated in the documentation:

.then(function (result) {
  // Transaction has been committed
  // result is whatever the result of the promise chain returned to the transaction callback

Result should contain stuff!

My code works and updates the database successfully, and enters the .then block, yet result logs as "undefined".

return sequelize.transaction(t => {
        return createUser(body, {transaction: t})
        .then(user => {
            if (user != null) {
                return createSetup({"user_id" : user.dataValues.id}, {transaction: t})
                .then(setup => {
                    console.log("setup was created")
                })
                .catch(err => {
                    throw new Error("the setup key was not created successfully... reverting transaction 2")
                })
            }
            else {
                throw new Error("no return value from creating user");
            }
        })
        .catch(err => {
            throw new Error("Failed to create user")
        })
    })
    .then(result => {
        console.log(result) //this returns undefined
        res.status(200).send({
            success: true,
            message: "The user was successfully created.",
        })
    })
    .catch(error => {
        console.log("error")
        res.status(400).send({
            success: false,
            message: error
        })
    })
})

I really want the result of the user object, but no matter what I do, it remains undefined. I have tried with and without returns on my subsequent functions within the transaction.

Answer 1

Try this

.then(setup => {
                    return { user, setup }
                })

Answer 2

I was under the assumption that

return createUser(body, {transaction: t})

would be "the result of the promise chain returned to the transaction callback

However, I needed to also return the user object in order to get it in result

return sequelize.transaction(t => {
        return createUser(body, {transaction: t})
        .then(user => {
            if (user != null) {
                return createSetup({"user_id" : user.dataValues.id}, {transaction: t})
                .then(setup => {
                    //this line is necessary to get the value in the result of the transaction
                    return user, setup
                })